Waterproof recycled paper and production method thereof

Abstract

Waterproof recycled paper and production method thereof are provided by the present invention. The waterproof recycled paper utilizes waste paper and plant fiber as raw material for papermaking. The waterproof recycled paper is produced by adding waterproof additive for size mixing after beating the paper pulp in a papermaking section, wherein the waterproof additive comprises oil, resin, starch, pectin, soda pulp, sulfite pulp, sulfate pulp, polyacrylonitrile, marble powder, water-soluble high polymer and sodium hydroxide, and combining with conventional process for papermaking. Without changing paper texture, the waterproof recycled paper of the present invention has waterproof property both on an outer and an inner surface thereof. The surfaces of the paper can be written or printed. The waterproof paper of the present invention has characteristics of white color, non-toxic and no smell. The paper can be dyed to any color without damaging the waterproof property thereof. The waterproof paper of the present invention can be utilized as wrapping paper, writing paper, paper for manufacturing protective clothing or paper bag, and can be recycled and thus is an environmental friendly paper.

1 - 10 . (canceled) 
     
     
         11 . A waterproof recycled paper, which is produced by a method comprising steps of:
 producing waste paper pulp utilizing a raw material of waste paper by pulping process for producing conventional paper,   producing plant fiber pulp by steaming a raw material of plant fiber for papermaking,   mixing the waste paper pulp and the plant fiber pulp to obtain a raw material of paper pulp,   processing the paper pulp with washing, screening, bleaching, hydrating and grinding,   adding waterproof additive for size mixing after beating the paper pulp in a papermaking section, so as to obtain paper stock, and   conveying the paper stock obtained to a paper machine for manufacturing paper with the paper stock.   
     
     
         12 . The waterproof recycled paper, as recited in  claim 11 , wherein the waterproof additive comprises oil, starch, water-soluble high polymer and sodium hydroxide. 
     
     
         13 . The waterproof recycled paper, as recited in  claim 11 , wherein the step adding waterproof additive for size mixing after beating the paper pulp in a papermaking section specifically comprises: during the papermaking section, after the process of beating the paper pulp is finished, adding additive accounting for mass fractions of the paper pulp as follows: oil 1%˜2%, resin 2%˜2.5%, starch 1%˜2%, pectin 1.5%˜2%, soda pulp 1.5%˜2%, sulfite pulp 1.5%˜2%, sulfate pulp 1%˜2%, polyacrylonitrile 1%˜2%, marble powder 1%˜2%, water-soluble high polymer 1%˜2%, and sodium hydroxide 2.5%˜3.5%. 
     
     
         14 . The waterproof recycled paper, as recited in  claim 12 , wherein the oil is plant oil which is natural oil, the resin is natural resin, the water-soluble high polymer is natural water-soluble high polymer comprising starch, cellulose and vegetable gelatin which are extracted from natural plant or animal, or at least one natural water-soluble high polymer which is processed with chemical modification. 
     
     
         15 . The waterproof recycled paper, as recited in  claim 13 , wherein the oil is plant oil which is natural oil, the resin is natural resin, the water-soluble high polymer is natural water-soluble high polymer comprising starch, cellulose and vegetable gelatin which are extracted from natural plant or animal, or at least one natural water-soluble high polymer which is processed with chemical modification. 
     
     
         16 . The waterproof recycled paper, as recited in  claim 11 , wherein a weight ratio of the waste paper pulp and the plant fiber pulp is: waste paper pulp:
 plant fiber pulp=35˜45%: 55-65%.   
     
     
         17 . The waterproof recycled paper, as recited in  claim 11 , wherein the during the step producing plant fiber pulp by steaming the raw material of plant fiber for papermaking, a weight ratio of an over dry tablet to well water, river water or tap water is 1:3. 
     
     
         18 . The waterproof recycled paper, as recited in  claim 11 , wherein the hydrating and grinding comprises a step of sending the mixed paper pulp which is processed with washing, bleaching and screening to a grinding system to grind for 30-240 min, so as to obtain beat pulp having a beating degree of 45° and SR-48°. 
     
     
         19 . The waterproof recycled paper, as recited in  claim 11 , wherein a concentration of paper pulp for loading to sieves of the papermaking machine is 0.1-1.2%. 
     
     
         20 . A method for manufacturing packaging material, printing material, decorative material and protective material which have waterproof property comprising applying the waterproof recycled paper as recited in  claim 11  as a base material. 
     
     
         21 . A method for producing waterproof recycled paper comprising applying waterproof recycled paper as recited in  claim 11  which is utilized and processed with recycling and purifying for serving as a fibrous material.